async function async1 () {
  console.log('async1 start')
  await async2();
  console.log('async1 end')
}
 
async function async2 () {
  console.log('async2')
}

console.log('script start')

setTimeout(function () {
  console.log('setTimeout')
}, 0)
 
async1();
 
new Promise (function (resolve) {
  console.log('promise1')
  resolve();
}).then (function () {
  console.log('promise2')
})

console.log('script end')


// script start
// async1 start
// async2
// promise1
// script end
// aysnc1 end
// promise2
// setToueout